Electronics > Projects, Designs, and Technical Stuff

Re-sealing SLA batteries

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edpalmer42:

--- Quote from: drummerdimitri on May 02, 2020, 01:14:54 pm ---I've watched multiple YouTube tutorials on refilling UPS SLA batteries with distilled water and using a de-sulfator, I was able to restore a battery's capacity from 2 Ah to 7 Ah.

The only issue now is keeping it sealing as the pressure of the released gas while charging/discharging either pops the lids off or starts leaking when taped all around.

Has anyone here had any luck with this or should I just toss them out and get new batteries instead?

--- End quote ---

There shouldn't be any significant pressure developed during charging and there shouldn't be any pressure at all during discharge.

SLA batteries aren't really sealed.  They all have a pressure release arrangement that allows a small amount of pressure during charge.  Anything more means the battery is being overcharged.  You should NOT try to completely seal them up.

What size are these batteries and how are you charging them?

Ed

splin:

--- Quote from: NiHaoMike on May 03, 2020, 03:20:37 am ---https://batteryhookup.com/products/emc-12v-module-with-8x-a123-26650
$10 for 8x 2.5Ah A123 LiFePO4 cells and BMS with built in voltage regulator. Granted, it would take some rather involved reverse engineering to use the BMS.

--- End quote ---

That's a good price but they are used cells and unlike the Ali express cells I linked it doesn't include shipping which could more than double the cost.

[EDIT] I tried to get the shipping cost but it's one of those intensely annoying websites that won't tell you before you've given them complete details including address,  telephone numbers,  bank A/C numbers, National Insurance  number,  a signed photo of your genitals as witnessed by an official notary/doctor/solicitor and the name of your first pet.

james_s:

--- Quote from: splin on May 03, 2020, 03:26:50 pm ---That's a good price but they are used cells and unlike the Ali express cells I linked it doesn't include shipping which could more than double the cost.

[EDIT] I tried to get the shipping cost but it's one of those intensely annoying websites that won't tell you before you've given them complete details including address,  telephone numbers,  bank A/C numbers, National Insurance  number,  a signed photo of your genitals as witnessed by an official notary/doctor/solicitor and the name of your first pet.

--- End quote ---

I ordered a couple of those packs since I happened to be in the market for some of those cells already and shipping was $16.97. They're based in the USA though so shipping international is going to be prohibitively expensive if they offer it at all. International shipping from the US has gotten absurdly expensive in the last decade or so.

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